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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e4a7b3b6c1ced4da68eab9b9c97eb906b4de16351b6eb88306b3592987a3bc' 
  AND token = 'Czgs6qrfLOXhJ8B2oENid60bOFpi4PxSdGRUXZ/uv04=' 
  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"
    }
  }
}