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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116e162df318088437fa8aec4bd39f51803e757a02f25685c833c18a2468b35e' 
  AND token = 'DMC/xZe8O68HMheKm2j3CVW76vKopCE/oGCr1zJOxus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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