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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c2cc2c70fc324afdd278abfe615973026aaa0ffab1a75dd402371bb1562421' 
  AND token = '2Rj0ZGmauuxXy2+C4dIomNTzV+zG9OHciN1L1Fmw0NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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