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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ac9e9c60c99d9861514d0ff61e9454a4557110327dc4482085ba4f7f36ff3c' 
  AND token = 'Q1D+xUuqUuTOrVYp89nTE8WfdoHIfK0ZT0+26yzawbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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