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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5f9ad6e01072cbb1d78b8766131c536528802574e62bb93b742c5f87e02c36' 
  AND token = 'hfUzGOSvAT3PtncZJqXkpqM2S20PDeFu2Ya3QFvHaUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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