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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b1a6f193a39af0a0b8aa9cb998c0a7fb37898eadc5ac61bf20e62b2e065124' 
  AND token = 'fHwDUEh3cLlRkDmWrmU/vWAtHCWpjNL1U/yLURU3AOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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