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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c24ecfe772f939bbb3e3233387b93b02d4f4c53296e4f50edf7a4c09496eaa8' 
  AND token = 'jv9GxvWaZL/QMd6Y+koxDa4LXFWAMAzyu41CRG3m+p4=' 
  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"
    }
  }
}