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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835d3b861a4074d33e35d86cd3849f4d11e6d59d468ff74458306de1943832fe' 
  AND token = '3m08ark29bzDDD40MblYmbt0zQZ5rEhESKKQfcvx7e0=' 
  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"
    }
  }
}