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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86a4583059a70440416cfae559a16abd9ac7e1df61e1b30fa64386894fd850f' 
  AND token = 'OngZGj+A1ztUXH6UBzZfRtSJ8+q59vuq5MsjTuPWr68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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