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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f4e270c5846cc7de3eec86dddb985843457580d8b6429abff5b36aac1d6770' 
  AND token = '9JF74SsV3qVsh47mOpZOkC9oS1kxd+e4D4VEf4EcpmE=' 
  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"
    }
  }
}