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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864f492d37e5f810536b9685c975c6fb2d14d298a58ec2b1d99c58f0d6fbeae1' 
  AND token = 'r3U8MgKmAooTfSvimroSqQvd5tW/wmkAGFTLi4OR/+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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