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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093884cf285753af0c442ec29d9b6643dcf495da8c209aaf0c573a44c8f338b5' 
  AND token = 'fxr2YHN/SLmBg/VwtaaiT3f9PttK/TuK9GgTCDsEN/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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