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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8d73e0a72fe314eaedb09eef3f4e2f546f61986ef028125b563e5c84df7b3f' 
  AND token = '3KqVY9jJkEtnJjEM/yJ5ZPoJiX38+Nq2ktV36o1vLQ0=' 
  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"
    }
  }
}