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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034f4bb5917e2e7803f5a66bd3dad45a40b801613a2dbbaba6596f9aa9c6422c' 
  AND token = '0AER61bJRrPPXTCDxICA9O8iPot7s0+qJBpLwLuid48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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