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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c959d5ea656144b1102cddd9650bdff78fbd7e2f7bce8b27ad227e202b81d89' 
  AND token = 'ysDmESGE9EZ91WwIHpO/fK9+lL5PtFIbWXGUB5QEpig=' 
  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"
    }
  }
}