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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ac60363ad8fb37de04fd8884895eccc5ac53d4b6798bfa958d52f0323c5c32' 
  AND token = '4kZUE3KV7By6MHniY2mBHNPAhzt5rRbBQC6dxQ6eA00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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