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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b416d333d0f20ef7d3000330a3cc9116ab7048d272dd3d2d58be0240f20b61' 
  AND token = '/HbBl91ZUMebUUPdNt1lnku8kMCnFyS+GXv+3y6PGY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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