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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3782d98e1826c9f141a9e7574d44914b4a8a38bfd936bb53efa849f1c557f7d' 
  AND token = 'C/cgFGWj7MAq0xeMXBrTf/9V3+WTnjTf1Noq8e1eMpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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