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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1270eaaa18dbce3e41e93b24cea49dff7a0fc333b649094f99fc7615631e8f6' 
  AND token = '+nV2QQrp8aJjhnPX6DIU8ozZiiFmVWU+RY7aadu3uTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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