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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d4c1ddf21ec3c4b9f9324109ca7167d2c2c84ed183835febc663d980b2ccad' 
  AND token = 'Pjn/XPdwbM5R/ggUEPOFYp4J2vwwm5I3L92atAH3tp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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