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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc93c17f59a634f29f24abaaefe88cc1f08eca4dd16b105f8d506399cd59eeaf' 
  AND token = 'pbonAh73Rb+Z550hWb3bD9F8Huajh6n7/2uIAASMfYo=' 
  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"
    }
  }
}