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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda3ca6cde79e1322b21b9ccad1b175cf885b0a041eb9cc6ae5bd18b02ea87fa' 
  AND token = 'wsWiyi64w4qYY34ixYh6oKs80GEBGv4xlFnDAx7LRUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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