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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f400750385769159ec57d31fca7bb0a4a8ee713a7ef79eede510d26bb53abc1a' 
  AND token = 'zUs06NjVFK+VLftWWOae5QQIs8sabZgYzqnhls409pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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