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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1652951b638d6a20087058e20d1506c7c4e24b93240bf6f5f1530c9dd76a90d' 
  AND token = 'bfNJQwC+kQpf/UxfRNFxa4o5ZALAeYQK8wY7DecUl4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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