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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120f198a1694b6fcfa69c931b3b1ceca117e4e50ff03d85483bdab9fa4adda25' 
  AND token = 'WNM2FdiqMeAJk1/hqdj5h96wF9t5xxGn0ZZzqM5jsiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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