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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96b056cf8937119d541fe3cd6d3d7799abcbff3d21d361228cb07f20605c3b4' 
  AND token = '6pWTWAoYhFpW8xyYsvyWmQAcdMRMCR4CJvDlAuAiSfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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