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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b0c812d7cde53459ef79c272f56de42d7915f005c4783eb8a3d26af155a2f5' 
  AND token = 'FCjCdLbGqs8T7QoOfYbMFqP+XoETLCAi16/UkFEyuPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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