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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed94716ec693a929892ee63ac0c2c814047c31a5c993cd253f58e3ed352eb59' 
  AND token = 'Nu5W/n/AG72eYG6PbYJfJjyl3y3unXx5euWR0AHTH2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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