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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ca13c0e0b96eda6fba3071ef0300e7dbb2e7f82a2e3097e1c7bef48dafad8a' 
  AND token = 'DDpDTiMuT5kboqmkKsLQuZiZlnp7JnhGJ988T5q8cwU=' 
  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"
    }
  }
}