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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491f0a87f03ef29cacc17e075b010840a9964b92771a91c4b27fac99a8231da2' 
  AND token = 'kKCx7kcJ+F2Mm1yMfN+w+qGCvk7fi+vhpwr7xh+3I5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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