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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8aafd21927d7e96268bf38f73e38d53f514d9aa835a1eb801d06dd876406102' 
  AND token = 'ipHrXXXt3EVKCOJTeqH/c3XJ0tqC94CgtJX/PGsJ/bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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