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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefc08abd60839655a91711103d837dd139fed686d3bd295510e2568f5210991' 
  AND token = 'lhkKesxnusHzhHhOTxyVCzoEKsxp81Jqd7ZqFRmxV+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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