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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99a9a883b7789a1131ab71cafa1f42cc2fa096567852d3a8446dbc0f0f6c96c' 
  AND token = 'cQjHV/V2z6tbKEI7Ld+9AVW5jr7g0c5nWIXLE8PmNtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}