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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345f81f979deb747e7148ff1618f894fa76d9d18bb75fa66e8b5763a8a35b7ab' 
  AND token = 'DJbItxNSoc8E0R0RmgUwDfqh49A2MRPw9eSUF0DMTYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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