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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3347382da36aaa6a2c9d4f6f69af24938b2025b0fdb5d3bb40a195904f6296' 
  AND token = 'rwUR/Vy/ouiqkC/DIcs9hI0ZGFHG+M5VsrYLu1aX4o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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