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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01f1fa3372f835dedb44c6bf11f3efa1ffef8664c8179eb6974c944799c251e' 
  AND token = 'W521rhgO5LXgXKILRcgmcRe+9Aq+H6IGTUbyYqZ+m3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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