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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab0aa9a81417880a501bb4de741c1ea34d7676e22a9ddb848c34b109825cec4' 
  AND token = 'VGH6PLxMCZVBbPEI94soWWr5k3wPBhWtM8357fUW/f4=' 
  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"
    }
  }
}