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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f80cfc6dd474968185bcaaf74a17a69c3a43c9018b651bd0bcab08b61dc11e' 
  AND token = 'bZSaZvb3ympV1oMQ5upo9KvoEAD5gLn3K8JNGi4phfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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