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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd0d5c1c0ad3de97c4a52e7d3b7ef101fe19c75f41779d869a76ae1f1eb3d76' 
  AND token = '7b5S7nlxnPlJ9FUCmp09NTqtBRsiCBzkf2QjJ6GKKbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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