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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f87ad6078b70733c722611d8a3cab244b244d37a7ab5878bb51ce2658b8158' 
  AND token = 'Yy8MpWUwjFUqW64GJNE4IumA+vx7dkus8QpHNtmX6Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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