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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f859e119a1b50f1b6b861be591e57c3d8f578ed3d923318f3fca3c846de17a28' 
  AND token = '1CQ/0c5tqhGLdQtXz7Do1IDnMTy1qbmoxkw1jM70osY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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