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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfc257f1b72fa67a2a9d6cdfcec8f99c15940e201111d4edd800d9e7ac4c008' 
  AND token = 'YW1s/7G1ygroX6FmIOXyl0AEZJ05iBpTxb9Jy6QpCj0=' 
  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"
    }
  }
}