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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ad8c08b3c84dc7e160d9a75f37140c3677232e7b55f30af792e3451c364c55' 
  AND token = 'MfkvPyag+Z6fnyk8ACxiPYP+QiOF6wxRGpwpQP6BEpU=' 
  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"
    }
  }
}