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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0599b7fe9d6d431be956f94fd24a41cc9f9ecd691464489dfdeded6ace7b024' 
  AND token = 'z076yrS3IbDBIF+AGNEK3H/sSe25RwGh+I3WUFiF3AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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