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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6dd72a1c7a5f22c75401cafa9c2a5ea2af3be89b6819bf9390a03b1cdb46c6' 
  AND token = 'isJVoWBDUDqIJV4Prj+67NMEsaQh6yOgmC+bLfKlJ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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