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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5dab2664d1f0577cfd9f033e804812448177e73f5e2da1872a92cca6929d68' 
  AND token = 'DkB21fQNQaoBXvQ2/TwOGT7SUdUJlXq7O4Eh5/elxs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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