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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2dd01bd0ee4dc3c3638d5f9060b30d6161bf1ef06d5912b90e8d12e4a5da75' 
  AND token = 'OvPYkmMTa0S78nbgHRnEoDcWIf6GOrjLpbA1hY3r+0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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