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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95532ea5783b16cc2c8534c005ea50529a561fdde346551868d8c06a205c25f' 
  AND token = '3+76YToNQyf43nrga4JVVp4Ldmj3hhNOo+qEa5GUcRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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