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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62d2ca22580779a5c45bcfd5f470d213095645c26791a813db4a5cd3f34c156' 
  AND token = 'jaexFeaiLnNYuHJpszF/9OulqF8c03BSc3OuWEse/OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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