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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c9ef4441b719d9e1f6d288503d878327c4d93f3ad663a6194e4fbe8a7ce3b8' 
  AND token = 'OjNm+2mrT/h92YGmteaBrwVpeLxHXeNqq2oOkSeURf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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