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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a258b97a0e3edf501f9a86daf18d512dfef6b76c1fa1da5f5def9505eba3c8e4' 
  AND token = 'fnXHHWEFu7ThwA7hE3iNQgw5zYKPlo+U/b3EE3PbB2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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