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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c33452a8521a4d8c4b92eae5019f6813cffcd31f41b8bdf493df6eefc0939a' 
  AND token = 'MVxxztsix3dZBJ94UcmsqyPbq7Y7PmFg1KKkKkZNmws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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