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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d854aeb3129f0a263b1450001bba11fb658de959ffd6afe5fe29eb0c978cc2' 
  AND token = 'BW0EJvZipflDr0Fl2PPnwfX1H1x3XKMnwZHuC8dFmjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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