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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a3aff37bd753bcd408cfbafa6d03b936153d6a81d0a436599f3a8dff6dc933' 
  AND token = 'zX7Sl10gJiB7ud6qRb49PfE3k60PEMhNNePB3A9icrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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