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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2108c01757e1fdb0a044f457cc277aa109d4a0bfac1e1bd68eb13f582cc8f34' 
  AND token = 'fM1LS6jmRx91WOw1DlaQZ2wL/9sWBjgHa1o8pDiV2VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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